The drivers are not signed or certified for XP, probably for good reason.
XP drivers v1.4 from ATEN's Website BSOD'ed both WinXP Home and Professional on a Medion laptop when connected to a Garmin GPS sending NMEA codes. CD drivers v1.3 did the same thing.
The CD Win98 drivers did not work on a Toshiba 320CT. The Website Win98 drivers do seem to work.
Short answer-- There are better products out there.
--NLG

-Anonymous

My computer has only one serial port, which I use to connect to my Belkin UPS. Then I bought a Pinnacle PCTV card with remote control. The remote control receiver needed another serial port. That's why I purchased this adaptor. Yes, it's driver is not certified for Windows XP, but I installed it anyway, and it worked fine. As you can see, transmitting remote control signals does not need high data rate. So the bottom line is: you will be satisfied by its performance as long as you don't put too much work load on it.

Buyer Beware

on 8/3/2003

The drivers are not signed or certified for XP, probably for good reason.
XP drivers v1.4 from ATEN's Website BSOD'ed both WinXP Home and Professional on a Medion laptop when connected to a Garmin GPS sending NMEA codes. CD drivers v1.3 did the same thing.
The CD Win98 drivers did not work on a Toshiba 320CT. The Website Win98 drivers do seem to work.
Short answer-- There are better products out there.
--NLG
Read More

it works on win xp

on 5/13/2004

My computer has only one serial port, which I use to connect to my Belkin UPS. Then I bought a Pinnacle PCTV card with remote control. The remote control receiver needed another serial port. That's why I purchased this adaptor. Yes, it's driver is not certified for Windows XP, but I installed it anyway, and it worked fine. As you can see, transmitting remote control signals does not need high data rate. So the bottom line is: you will be satisfied by its performance as long as you don't put too much work load on it.
Read More

Great Product

Adheres to ISA and RS232 Specifications

on 6/29/2008

This adapter works where Specifications need to be strictly followed. Most others do not. Despite not submitting to Bill Gates for certification, it works and works flawlessly. I would not waste the time purchasing any other USB/RS232 adapter... at any cost.
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Product Overview

The Hawking UC232S USB to RS232 Serial Adapter provides an external Plug and Play RS-232 serial connection with your computer, letting you free up your existing serial ports. Users have the capability to utilize the adapter with serial port interface in an easy-to-use environment. The adapter is designed for connections to cellular phones, PDAs, digital cameras, modems, or ISDN terminal adapters through your USB port with a data transfer rate of over 230kbps. Installation is easy. Simply plug a serial device into the UC-232A adapter and plug the USB port into the computer. No IRQs are needed so there are no IRQ or Com port conflicts.

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$28.86 + free shipping
Condition: Brand NewIn Stock,45 Day ReturnsShips within 1-2 business days. Items in stock at time of listing; inventory subject to change. See our positive feedback from THOUSANDS of SATISIFIED CUSTOMERS online.
Usually ships in 1 to 2 business days